Will a pipe rated for 0.2 MPa definitely be fine when subjected to negative pressure?
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There is a pipeline with an operating pressure of 0.2 MPa; when it was first designed, negative pressure was not taken into account. It is said that it can withstand positive pressure, so it should be fine even with negative pressure as well, right?
In this case, it is necessary to recalculate based on the actual usage.
What is the diameter, what is the wall thickness, and what material is it made of?
Positive pressure design primarily takes strength into account, while negative pressure design focuses on stiffness
No, as the original poster said, for a pipe with a pressure rating of 0.2 MPa, the wall thickness must be very small, and it cannot withstand negative pressure.
Whether it can withstand the stress depends on the pipe diameter and wall thickness. If it’s a regular pipe and the temperature isn’t high, there’s no problem
Negative pressure can cause instability, and specific calculations are required
For large-diameter, thin-walled pipes, care must be taken regarding the possibility of instability under negative pressure